I'm confused. -66 289/302 won't crank. I mean not a click, nada. I have replaced the battery cables and the ground strap, and the starter. I had the battery checked just today, and it states good. If I bypass everything and just put the positive cable straight from the battery to the starter and the ground from the battery to the block, it sparks like it's drawing tons of power, but there's not an inkling of cranking. The engine turns by hand with a wrench on the crank. What am I missing?